package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.dto.SetmealDto;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.entity.SetmealDish;
import com.itheima.reggie.mapper.SetmealMapper;
import com.itheima.reggie.service.SetmealDishService;
import com.itheima.reggie.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    SetmealDishService setmealDishService;

    /**
     * 新增套餐，同时保存套餐和菜品的关系
     *
     * @param setmealDto
     */
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {

        //A. 保存套餐基本信息
        this.save(setmealDto);
        //B. 获取套餐关联的菜品集合，并为集合中的每一个元素赋值套餐ID(setmealId)

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();

        setmealDishes.stream().map((item) -> {
            item.setSetmealId(setmealDto.getId());
            return item;
        }).collect(Collectors.toList());

        //C. 批量保存套餐关联的菜品集合
        setmealDishService.saveBatch(setmealDishes);
    }

    /**
     * 删除套餐，同时删除套餐和关联菜品的关联数据
     *
     * @param ids
     */
    @Transactional
    public void removeWithDish(List<Long> ids) {
        //select count(*) from setmeal where id in (1,2,3) and status = 1
        //查询套餐状态，确定是否可用删除

        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId, ids);
        queryWrapper.eq(Setmeal::getId, 1);
        int count = this.count(queryWrapper);

        if (count > 0) {
            //正在售卖的套餐，不可以删除，在此处抛出业务异常
            throw new CustomException("套餐售卖中，无法删除");
        }

        //如果可以删除，先删除setemeal表中的数据
        this.removeByIds(ids);

        //delete from setmeal_dish where setmeal_id in (ids[])

        LambdaQueryWrapper<SetmealDish> queryWrapper1 = new LambdaQueryWrapper<>();
        queryWrapper1.in(SetmealDish::getSetmealId, ids);
        //删除关联表中的数据
        setmealDishService.remove(queryWrapper1);
    }

    /**
     * 批量修改套餐售卖状态
     *
     * @param status
     * @param ids
     */
    @Transactional
    public void updateSetmealStatusByIds(Integer status, List<Long> ids) {
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(ids != null, Setmeal::getId, ids);

        List<Setmeal> list = this.list(queryWrapper);
        //  queryWrapper.eq(Setmeal::getStatus,1);

        for (Setmeal setmeal : list) {
            if (setmeal != null) {
                setmeal.setStatus(status);
                this.updateById(setmeal);
            }
        }
    }
}
